This theory says that the Earth stays in the center of the Universe and that the stars, the Sun, the planets, and the Moon revolve around it.
Geocentric theory
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This theory says that the Sun stays in the center of the Universe and that the Earth and the planets revolve around it.
Heliocentric theory
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This scientist formulated the Heliocentric theory of the Universe in 1543.
Nicolas Copernicus
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All the matter, energy, and space that exist is collectively know as ________?
the Universe
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The theory which explains the origin of the Universe is called ________?
the Big Bang theory
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The galaxy we live in is called ________________.
The Milky Way
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The Milky Way is a spiral galaxy with four arms. It belongs to which galaxy cluster?
The Local Group
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Huge clouds of gases occupying the space between the stars are called ______.
Nebulae
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Celestial bodies which emit their own light are called _______.
stars
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The Solar System is made up of how many planets?
eight
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This is the Earth's only natural satellite.
the Moon
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These are rocky bodies which orbit a planet.
satellites
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These are bodies which orbit a star.
planets
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They are small and round rocky bodies which have not cleared their orbit around the Sun of other similar bodies. Some of them are Pluto, Ceres, Eris, etc.
dwarf planets
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They are rocky and irregular shaped bodies. Their size goes from few meters to hundred kilometers in diameter.
